Added folder and datacenter to the examples (#25221)

* Added folder and datacenter to the examples

From #22644 it seems that the parameter 'folder' is mandatory. While both are required parameters they should be used in the examples.

* Removed 'required: True' from folder documentation

I reverted the documentation of the folder option to be a not required one. This way it stays consistent with the definition of the function.

lib/ansible/modules/cloud/vmware/vmware_guest_snapshot.py

@@ -110,6 +110,8 @@ EXAMPLES = '''
       hostname: 192.168.1.209
       username: administrator@vsphere.local
       password: vmware
+      datacenter: datacenter_name
+      folder: /myfolder
       name: dummy_vm
       state: present
       snapshot_name: snap1
@@ -122,6 +124,8 @@ EXAMPLES = '''
       username: administrator@vsphere.local
       password: vmware
       name: dummy_vm
+      datacenter: datacenter_name
+      folder: /myfolder
       state: remove
       snapshot_name: snap1
     delegate_to: localhost
@@ -131,6 +135,8 @@ EXAMPLES = '''
       hostname: 192.168.1.209
       username: administrator@vsphere.local
       password: vmware
+      datacenter: datacenter_name
+      folder: /myfolder
       name: dummy_vm
       state: revert
       snapshot_name: snap1
@@ -141,6 +147,8 @@ EXAMPLES = '''
       hostname: 192.168.1.209
       username: administrator@vsphere.local
       password: vmware
+      datacenter: datacenter_name
+      folder: /myfolder
       name: dummy_vm
       state: remove_all
     delegate_to: localhost